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  1. C

    Mainship 390 - single vs twins - speeds

    Great info on the Yanmar performance figures. I have had a hard time finding actual real world numbers. Thank you Bacchus!
  2. C

    Mainship 390 - single vs twins - speeds

    Hi Craig here, New to the forum and looking at some Mainship 390's. Trying to figure out the manufacturer history of these boats and obtain some performance data. Can anyone provide real world numbers on obtainable cruising speeds vs WOT and fuel gph? Online I have read that the single 370...
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